Design principles and performance analysis of SSCOP

Abstract

The Service Specific Connection Oriented Protocol (SASCOP) has been approved recently as a new B-ISDN ATM Adaptation Layer (AAL) protocol standard, initially for use in the Signaling ATM Adaptation Layer (SAAL), but also for support of certain types of use data transfer. SSCOP is a new type of protocol, embodying several design principles for high speed link and transport layer protocols. In this paper, the basic operation of SSCOP is described and the SSCOP design is compared with other similar protocols. Next, the relationships between key protocol parameters (protocol window, control message transmission interval) and maximum achievable throughput effieiency are explored. In particular, approximate performance equations are derived for predicting the maximum throughput efficiency of SSCOP basedon the selected environment and parameter eettings. The equations can be used to determine how much buffer capacity and/or what protocol timer settings allow SSCOP to operate at high performance. The analytical results are confirmed through comparison with simulation results. In addition, simulation results illustrate the high throughput performance achievable when using SSCOP in a highly errored or loosy environment.